Zobrazeno 1 - 10
of 281
pro vyhledávání: '"Helmerson, K."'
Autor:
Starkey, P. T., Billington, C. J., Johnstone, S. P., Jasperse, M., Helmerson, K., Turner, L. D., Anderson, R. P.
Publikováno v:
Rev. Sci. Instrum. 84, 085111 (2013)
We present the labscript suite, an open-source experiment control system for automating shot-based experiments and their analysis. Experiments are composed as Python code, which is used to produce low-level hardware instructions. They are queued up a
Externí odkaz:
http://arxiv.org/abs/1303.0080
Autor:
Ramanathan, A., Wright, K. C., Muniz, S. R., Zelan, M., Hill III, W. T., Lobb, C. J., Helmerson, K., Phillips, W. D., Campbell, G. K.
Publikováno v:
Phys. Rev. Lett. 106, 130401 (2011)
We have created a long-lived (~ 40 s) persistent current in a toroidal Bose-Einstein condensate held in an all-optical trap. A repulsive optical barrier creates a tunable weak link in the condensate circuit, which can affect the current around the lo
Externí odkaz:
http://arxiv.org/abs/1101.0019
We present experimental results on a Bose gas in a quasi-2D geometry near the Berezinskii, Kosterlitz and Thouless (BKT) transition temperature. By measuring the density profile, \textit{in situ} and after time of flight, and the coherence length, we
Externí odkaz:
http://arxiv.org/abs/0805.3519
Autor:
Ramos, E. R. F., Henn, E. A. L., Seman, J. A., Caracanhas, M. A., Magalhães, K. M. F., Helmerson, K., Yukalov, V. I., Bagnato, V. S.
Publikováno v:
Phys. Rev. A 78, 063412 (2008)
A technique is proposed for creating nonground-state Bose-Einstein condensates in a trapping potential by means of the temporal modulation of atomic interactions. Applying a time-dependent spatially homogeneous magnetic field modifies the atomic scat
Externí odkaz:
http://arxiv.org/abs/0805.3083
We have observed the persistent flow of Bose-condensed atoms in a toroidal trap. The flow persists without decay for up to 10 s, limited only by experimental factors such as drift and trap lifetime. The quantized rotation was initiated by transferrin
Externí odkaz:
http://arxiv.org/abs/0709.0012
Autor:
Andersen, M. F., Ryu, C., Clade, Pierre, Natarajan, V., Vaziri, A., Helmerson, K., Phillips, W. D.
We demonstrate the coherent transfer of the orbital angular momentum of a photon to an atom in quantized units of hbar, using a 2-photon stimulated Raman process with Laguerre-Gaussian beams to generate an atomic vortex state in a Bose-Einstein conde
Externí odkaz:
http://arxiv.org/abs/quant-ph/0607171
Autor:
Reiner, J. E., Crawford, A. M., Kishore, R. B., Goldner, Lori. S., Gilson, M. K., Helmerson, K.
We demonstrate a novel technique for creating, manipulating, and combining femtoliter volume chemical containers. Possible uses include creating controlled chemical reactions involving small quantities of reagent, and studying the dynamics of single
Externí odkaz:
http://arxiv.org/abs/physics/0510196
Publikováno v:
Phys. Rev. A 72, 053605 (2005)
We have performed experiments using a 3D-Bose-Einstein condensate of sodium atoms in a 1D optical lattice to explore some unusual properties of band-structure. In particular, we investigate the loading of a condensate into a moving lattice and find n
Externí odkaz:
http://arxiv.org/abs/cond-mat/0504606
Autor:
Denschlag, J Hecker, Simsarian, J E, Haeffner, H, McKenzie, C, Browaeys, A, Cho, D, Helmerson, K, Rolston, S L, Phillips, W D
We have performed a number of experiments with a Bose-Einstein condensate (BEC) in a one dimensional optical lattice. Making use of the small momentum spread of a BEC and standard atom optics techniques a high level of coherent control over an artifi
Externí odkaz:
http://arxiv.org/abs/cond-mat/0206063
Autor:
McKenzie, C., Denschlag, J. Hecker, Haeffner, H., Browaeys, A., de Araujo, Luis E. E., Fatemi, F. K., Jones, K. M., Simsarian, J. E., Cho, D., Simoni, A., Tiesinga, E., Julienne, P. S., Helmerson, K., Lett, P. D., Rolston, S. L., Phillips, W. D.
We report on the formation of ultra-cold Na$_2$ molecules using single-photon photoassociation of a Bose-Einstein condensate. The photoassociation rate, linewidth and light shift of the J=1, $v=135$ vibrational level of the \mterm{A}{1}{+}{u} molecul
Externí odkaz:
http://arxiv.org/abs/cond-mat/0111501